Stereoselective Synthesis of Either <i>Exo-</i> or <i>Endo-</i>3-Azabicyclo[3.1.0]hexane-6-carboxylates by Dirhodium(II)-Catalyzed Cyclopropanation with Ethyl Diazoacetate under Low Catalyst Loadings
作者:Terrence-Thang H. Nguyen、Antonio Navarro、J. Craig Ruble、Huw M. L. Davies
DOI:10.1021/acs.orglett.3c03652
日期:2024.4.12
Although cyclopropanation with donor/acceptor carbenes can be conducted under low catalyst loadings (<0.001 mol %), such low loading has not been generally effective for other classes of carbenes such as acceptor carbenes. In this current study, we demonstrate that ethyl diazoacetate can be effectively used in the cyclopropanation of N-Boc-2,5-dihydropyrrole with dirhodium(II) catalyst loadings of
尽管用供体/受体卡宾进行环丙烷化可以在低催化剂负载量下进行(N-Boc-2,5-二氢吡咯,二铑(II)催化剂负载量为0.005mol%。通过适当选择催化剂和水解条件,外型或内型-3-氮杂双环[3.1.0]己烷可以干净地形成,具有高水平的非对映选择性,无需色谱纯化。